Author Archives: Robins

When the fastJson tool class converts the installed list into JSONArray, the key whose value is null in the hashmap will also be lost.

Problems encountered: The fastJson utility class will have List&LT installed; HashMap> When converted to a JSONArray, the key with null value in the HashMap is also lost. Code:

JSONArray dataArray=JSONArray.parseArray(JSON.toJSONString(datalist))

 
Solutions:

JSONArray dataArray=JSONArray.parseArray(JSON.toJSONString(datalist,SerializerFeature.WriteMapNullValue))

 

A yellow warning appears on the pagecontroller page in PHP! ! ! !

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On the problem of error reporting in Pagecontroller in PHP
* *
looks just like me a lot of people started just dumb to find why the error, but this is not a mistake, page controller is running, just no display in the current page, so there will be prompted to alert, so you need to add url address behind you to display the page address (the name of the PHP file)
if

and error before the url is:


did not report an error when it was opened for the first time, but when it was opened again the next day, I do not know how to report an error. Moreover, it was an error in the source code.
this error probably speak pathinfo is not open, online a lot of code is said to modify the PHP ini file configuration inside, but I was configured also not the last line error, finally it is helpless, can only reinstall warmserver, the import pagecontroller, but still no use, it’s helpless, had to once again to look for ways to solve the problem, and finally found that there is no creation page, really sick…
the first step is to locate the php.ini file,e… I didn’t know where to start, because there were so many directories that I couldn’t find them, and then I started searching the Internet for where the files were. So there are still a lot of detours in the beginning of a language, and these detours are also another kind of learning of the language.

error LNK2019: Unresolved external symbol-resolution record

Error LNK2019: External symbol that cannot be resolved

Vs2015 recently encountered a compile problem, error LNK2019: cannot resolve the external symbol of
from some search on the net, compare to see the, the project properties dependent libraries do not have what problem, win32 platform no problem, 32 bit ok
finally found their own header file, found in. H and. Repeated wrote the new CPP rely on header files, remove after returning to normal

composer Failed to decode response: zlib_decode(): data error

Composer error problem

Failed to decode response: zlib_decode(): data error
Retrying with degraded mode, check https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode for more info

The cause of this error is usually the network.
The solution
Composer page provides a degraded mode solution. If we have ipv6 on we need to uncheck ipv6.

How to Fix Tomcat Error: Failed to destroy end point associated with ProtocolHandler[ajp-nio-8009]


Foreground summary: The maven repository that we installed is by default in the M2/Repository on disk C, but Windows users have their operating systems installed on disk C, so it is dangerous to put the Maven repository on disk C, so we need to modify the local repository path. Today the framework of the maven dependent libraries to replace the download address and the location of the store, because before use is a website, download or update the configuration file is particularly slow, is really can’t stand to replace more ali cloud with maven repositories, feel the speed suddenly increased n level, of course, the error is also my errors after running Tomcat after change.

Problem: Because I changed the location of the Maven repository’s Settings.xml, the configuration environment was inconsistent with the default environment variables, causing Tomcat to run incorrectly.
Solutions:1. Open MyEclipse and click Windows-& GT; preferences-> maven-> Add a Maven that has been installed in the D:\Java directory, as: D:\Java\ Maven-3.0.4, and check the attached item. And click the browse button below to open Maven’s global configuration file, such as D:\Java\ Maven-3.0.4 \conf\ fine.xml. (Skip this step if it is already installed)
2. Open MyEclipse and click Windows-& GT; preferences-> maven-> Under User Setting, change the User Setting option to D:\Java\m2\ Repository \ Settings. XML, and click Update Settings. And click the reIndex button below to update the index.
3. Click the Apply button in the configuration window to highlight the configuration window.
4. Finally, open CMD and execute MVN help: System. You will find that all the JARS Maven downloads from the remote library will be placed in the newly modified path D:\Java\m2\ Repository.

How to Fix Android Error:This Gradle plugin requires Studio 3.0 minimum

Today, I’ll continue a quick overview of how to resolve an Error:This Gradle Plugin requires Studio 3.0 minimum.
I’ve talked a little bit about this before, and it’s a little bit incomplete, so let me write it down again.Reason: The project USES version 3.0 and the computer installed version 2.2.2. The error report of the imported project Gradle

Solutions:
Solution a:
Build. Gradle

Instead of ‘com. Android. Tools. Build: gradle: 2.3.3’
Scheme 2:
Gradle. In the properties
Add android. Injected. Build. Model. Only the versioned = 3
If not, or continue to gradle. The properties file to add an android. Injected. TestOnly = false

Android :This Gradle Plugin requires Studio 3.0 minimum.

It’s that simple.

Error in sitecustomize set PYTHONVERBOSE for traceback KeyError: ‘PYTHONPATH’

Error in sitecustomize; Set PYTHONVERBOSE for traceback: KeyError: ‘PYTHONPATH’
1. Background of the problem
Python2.7 comes with Mac, and python3.6 comes with your own Anaconda installation. After the opencv installation, the following prompts

after the following installation steps are prompted, open Spyder to run the program again or use python3 on the terminal will be prompted as the question error
Reason 2.
Sys. path adds the site-package of Python27. conflict
3. Solve
To “…/local/lib/python3.6/site-packages/ “under directory (directory only for people)
execute $vim homebrew. PTH
remove the path inside
4. Exit terminal/restart Spyder without error

How to Fix char cannot be dereferenced Error

error: char cannot be dereferenced
Error code

	if(row.charAt(m).equals('0')){
		matrix[i][j]=0;
	}

Where the row is a string.
2. Error reason
Ross: Yeah, I mean, derefrence. The value that points to

The type char is a primitive — not an object — so it cannot be dereferenced
derefer0 derefer0 is The process of authentication The value green to by a reference. Since a char is already a value (not a) reference), it can not be dereferenced.
use Character class:
if(Character.isLetter())

char
char
char is a primitive type.
Character is its wrapper class, reference type, and equals() method. == instead of directly comparing values.

python3 Error in sitecustomize; set PYTHONVERBOSE for traceback: NameError: name ‘modules_list’ …

Error in Sitecustomize; set PYTHONVERBOSE for traceback: NameError: name ‘modules_list’ is not …The original link: https://www.jianshu.com/p/b1ed42918380
Error in sitecustomize; set PYTHONVERBOSE for traceback:
NameError: name ‘modules_list’ is not defined

Problem. PNG
Modify a file called sitecustomize.py to be located under C:\python3\Lib\site-packages and change the name to Sitecustomize_back. py


File location. PNG

File name modified. PNG

Run without error. PNG